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Do It Yourself Articles  

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Friday, August 10, 2007
Drivetrain improvements that actually work
By Steve @ 8:10 PM :: 879 Views :: 2 Comments :: :: Engine - Chevy, Chassis - P30
 
Hello Everyone, I wish to relate a project that has been ongoing for two years & too many dollars to comfortably recall. My84 Windcruiser p-30 motorhome is in very good condition except for the running gear. one of the first things to go was the transmission (due to pulling a heavy trailer to florida a couple of times). after buying a TCI trans & converter, I equipped it with a derale vented deep trans pan & GM red stripe vacuum modulator. Take note for all transmissions use Trans Guard additive imediatley! Results are a veritable sucess as I tow a 12000lb trailer most of the time now with not even a wimper from the tranny.
 
The next item was a set of ceramic Hedman Hedders, these are attached to summit 2.5" "x" pipes (NOT an H pipe) After this are a set of "DNA" stainless mufflers about three feet back from fhe "x" and After these are flowmasters exiting through Gibson turndowns in front of the rear tires this system is very free flowing & at highway speeds is not audible inside the coach and still lets the engine breathe.
 
The addition Harland Sharp ROLLER rocker arms with a 1.8 ratio gives .040 increased valve lift & frees up around 25 HP or more while reducing heat buildup. A Weiand "peanut" port Action Plus manifold and Edelbeock 650 Thunder series carburetor ( tighten the secondary one quarter turn tighter to stop the bog). A split plenum carb gasket from edelbrock & K&N filter element.
 
My ignition is a jacobs RV series computer & coil this unit has an inclinometer that supplies the coilwith 525 volts for up to 55 seconds for climbing hills & I have never had engine knock running regular gas. Along with jacobs ceramic plug wires, cap & rotor & advance curve kit using the middle springs & NGK plugs gapped at .060, completes the top end. I recently had the pleasure of removing the oil pan to install what I think was long overdue for
 
All chevies is a one piece oil pan gasket, at this point I modified the oil pump by using a time tested method by removing the oil pump bypass spring & placing a Holley jet or 1/4" spacer behind it,this has always resulted in a ten to twenty pound increase in oil pressure. (Only do this on a good pump as it wont help you if your pump is worn out & high volume pumps do not need any mods). While apart the stock cam is advanced four degrees with a double roller timing chain set and cam button to stop cam walk. Up front is a TEAM "G" aluminum water pump which weighs 10 lbs less, moves 15 gallons more a minute while using less HP to turn it no need for the bypass hose but use a 180 degree new style "Safety" thermostat.
 
Try to get fresh cool air into the engine, I used flex dryer exhaust hose covered with insulated ducting covering it, ahead of this is a 600 cfm air pusher providing mild boost to the carb (dont laugh it WORKS). All this may seem a little extreem to some but I am a hot rodder still & I couldn't resist playing with this to see noticeable seat of the pants results & I'm overwelmed with the "NEW" Motorhome!
 
Yes I would do it again. There are no drag strip time slips but I now move along with the big pushers with ease & the BEST part is gas mileage averages 11 to 13 mpg bobtail & 7 9 mpg towing my Nomad around florida for car shows. I hope this article will help anyone curious about these improvements.
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Comments
By COOPERHAWK @ Saturday, August 11, 2007 10:47 AM
Very informative article. It is a little hard for an old fellow like me to read though. Needs to be bigger font and broken up into paragraphs. Good results!

By Airstream345 @ Saturday, August 11, 2007 1:53 PM
Steve, thanks for the article. I like the mods you've made and appreciate sharing them with the membership here. I went ahead and tried to "clean up" the formatting a little for you...I hope it helped.

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